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# Need Help With Grade 12 Chemistry Question!?

PCl5(g)↔PCl3(g)+Cl2(g)

2.5 M of phosphorus pentachloride are mixed with 0.60 M of phosphorus trichloride and chlorine. Will a reaction occur? In which direction will the reaction occur? If K250℃=0.042, what are the final equilibrium concentrations?

### 1 Answer

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- OCVLv 66 years agoFavorite Answer
K = (c(PCl3)* c(Cl2)) / c(PCl5)

Put in the values and solve K, if K is greather than 1, the reaction will occur.

For the second question, you need to calculate all concentrations.

K = 0,042

c(PCl5) = c0 -x

c(PCl3) = c0 + x

c(Cl2) = c0 +x

K = [ (c(PCl3)+x)* (c(Cl2))+x) / (c(PCl5)-x) ]

Now solve for x, you'll get a quadratic equation. However, only one solution for x will be the right one (the other one will make the concentrations negative)

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